I still remember that weird bug that forced everyone to create a single, empty, invisible DIV at the beginning of the page if you wanted to set absolute positions for the other DIVs in the page.

In Javascript land, we all had our little script to detect the browser and do things like finding the element you wanted (IIRC, only IE had find by id).

All in all, I miss the carefulness webdevs had to have at the time (I remember uglifying my files by hand to make everything weight less than 24KB, which was the self-imposed limit we had at the dotcom I worked at) but, in general, I don't miss those days at all.